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JeffN wrote:From a colleague..
http://www.todaysdietitian.com/newarchi ... 0p46.shtml
A few others
From a review study on the topic...
"High fat intake does not seem to be effective in increasing exercise performance over a high carbohydrate diet. A study done on trained cyclists found that those who consumed a high fat meal four hours prior to exercise had slightly smaller endurance capacities compared to those who ate a high carbohydrate meal instead. Consumption of a high fat meal (68% of energy from fat) after a bout of exercise also did not produce a higher exercise capacity in exercise done twelve hours later (compared to an isocaloric high carbohydrate meal with 83% total energy from carbohydrate).
Other researchers have found that high fat diets do not improve exercise endurance over high carbohydrate diets. Helge et al. subjected cyclists to seven weeks of training on either a high fat or high carbohydrate diet (carbohydrate/fat/protein %: 21/62/17 or 65/20/15). The mean time to exhaustion for the high fat group was significantly lower than for the high carbohydrate group, although both groups did better than they had before beginning the training program. During the eighth week both groups were placed on a high carbohydrate diet. The high fat group's endurance increased significantly, but still did not match that of the high carbohydrate group. Helge's group followed their 1996 paper with a similar experiment in which they measured exercise endurance after four weeks. After this period of time, the endurance of the high fat group did not differ significantly from that of the high carbohydrate group. However, after continuing the diets two weeks longer, they discovered that the high carbohydrate training group continued to better their time to endurance while the high fat group remained about the same as at four weeks."
Burke LM and Hawley JA. Effects of short-term fat adaptation on metabolism and performance of prolonged exercise. Med Sci Sports Exerc 34: 1492â€“1498, 2002.
Burke LM, Hawley JA, Angus DJ, Cox GR, Clark S, Cummings NK, Desbrow B, and Hargreaves M. Adaptations to short-term high-fat diet persist during exercise despite high carbohydrate availability. Med Sci Sports Exerc 34: 83â€“91, 2002.
Helge JW, Richter EA, and Kiens B. Interaction of training and diet on metabolism and endurance during exercise in man. J Physiol 492: 293â€“306, 1996.
Kiens B and Helge JW. Adaptations to a high fat diet. In: Nutrition in Sport, edited by Maughan RJ. Oxford, UK: Blackwell Science, 2000, p. 192â€“202.
Helge, J W Adaptation to a fat-rich diet: effects on endurance performance in humans.Sports Med. 2000 Nov;30(5):347-57.
"However, those at the coal-face of sports nutrition can delete fat loading and high-fat diets from their list of genuine ergogenic aids for conventional endurance and ultra-endurance sports."
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